CAJ | 학술논문

用心形线表征了一种增压器无叶蜗壳梨形流道横截面轮廓，用有限差分法对增压器蜗壳内无叶喷嘴出口流场进行了数值模拟计算，研究了喷嘴宽度(B)对其出口流场的影响。结果表明，喷嘴出口速度及气流角(α)分布不均匀，随着B沿蜗壳轴向减小，α逐渐减小且其分布趋于较均匀，而喷嘴出口速度逐渐增加但其分布趋于恶化；B减小到一定程度后，喷嘴出口流场变化不大。B沿蜗壳周向线形减小时，可改善α分布，但速度改善不明显。
용심형선표정료일충증압기무협와각리형류도횡절면륜곽，용유한차분법대증압기와각내무협분취출구류장진행료수치모의계산，연구료분취관도(B)대기출구류장적영향。결과표명，분취출구속도급기류각(α)분포불균균，수착B연와각축향감소，α축점감소차기분포추우교균균，이분취출구속도축점증가단기분포추우악화；B감소도일정정도후，분취출구류장변화불대。B연와각주향선형감소시，가개선α분포，단속도개선불명현。
he pear-shaped flow section contour of turbocharger scroll is featured by heart-shaped line. The flow field of nozzle outlet is simulated by using FDM,and the influence of nozzle width B on its flow field is investigated. The nozzle outlet velocity and flow angle α are uneven,and with the B axial increase the α decreases gradually and its distribution tends even,but the velocity increases constantly and its distribution becomes worse. The flow field of nozzle outlet varies a little as the B decreases to some extent. As the B decreases linearly along the scroll circumference,the distribution of α is improved, but the velocity is improved a little.